// import total from '@/tools/total.js'

/* const totalCount= (arr) =>{
  let c = 0
  arr.forEach(
    x => c += x.goods_count)
  return c
} */

/* function totalCount(arr){
  let c = 0
  arr.forEach(
    x => c += x.goods_count)
  return c
} */

function totalCount(arr){
  return arr.reduce((total, item)=> total += item.goods_count, 0)
}

export default {
  namespaced: true,
  
  state: () => ({
    cart: JSON.parse(
      uni.getStorageSync('cart') || '[]')
  }),
  
  mutations: {
    addToCart(state, goods){
      const findResult = state.cart.find(
        x => x.goods_id === goods.goods_id) 
      if(!findResult){
        state.cart.push(goods)
      }else{
        findResult.goods_count ++
      }
      
      this.commit('m_cart/saveToStorage')
    },
    saveToStorage(state){
      uni.setStorageSync(
        'cart', JSON.stringify(state.cart))
    },
    // 更新购物车中商品的勾选状态
    updateGoodsState(state, goods){
      const findResult = state.cart.find(
        x => x.goods_id === goods.goods_id)
      if(findResult){
        findResult.goods_state = goods.goods_state
        this.commit('m_cart/saveToStorage')
      }
    },
    updateGoodsCount(state, goods){
      const findResult = state.cart.find(
        x => x.goods_id === goods.goods_id)
      if(findResult){
        findResult.goods_count = goods.goods_count
        this.commit('m_cart/saveToStorage')
      }
    },
    removeGoodsById(state, goods_id){
      // 将满足条件的筛选出来形成的数组就是删除了该id的数组
      state.cart = state.cart.filter(x => x.goods_id !== goods_id )
      this.commit('m_cart/saveToStorage')
    },
    updateAllGoodsState(state, newState){
      state.cart.forEach(x => x.goods_state = newState)
      this.commit('m_cart/saveToStorage')
    }
  },
  getters: {
    total(state){
      // let c = 0
      // state.cart.forEach(
      //   x => c += x.goods_count)
      // return c
      
      // return state.cart.reduce((total, item) => total += item.goods_count, 0)
      
      // return total.totalAmount(state.cart);
      
      return totalCount(state.cart)
    },
    checkedCount(state){
      // return state.cart.filter(x => x.goods_state)
      //   .reduce((total, item) => total += item.goods_count, 0)
      
      // return total.totalAmount(state.cart.filter(x => x.goods_state))
      
      return totalCount(state.cart.filter(x => x.goods_state))
    },
    checkedGoodsAmount(state){
      return state.cart.filter(x => x.goods_state)
        .reduce((total, item)=> total += item.goods_count * item.goods_price, 0)
        .toFixed(2)
    }
  }
}